the dreaded exhaust question (again)

[Cloudsurfer]

Originally Posted by 2K3_Boxster_S

You can get 18hp if you do intake and full exhaust. see NHP exhaust thread.
Whether that's a minimal gain is dependent on what an individuals perception of expected results is compared to $$$ spent. It's not a cheap upgrade and it can't be done through ebay.

Hate to point it out to you, but the NHP is made in China "cheap" stuff.

[2K3_Boxster_S]

Originally Posted by Cloudsurfer

Hate to point it out to you, but the NHP is made in China "cheap" stuff.

Wrong. made in Canada. not even close to ebay cheap. Welds are beautiful, no fitment issues. China doesn't use T-304 stainless either. You got the wrong company.

[jmatta]

I think 18HP is pretty optimistic...there's no substitute for torque and you're not going to get appreciable increases with modifications. Gains will be at higher RPMs where it's mostly unused. I am not a technician, but have worked with my Porsche engine builder for years on track setups and know where dollars should or should not be spent.

[ekam]

NHP headers never look right in my eyes IMO, with the unequal length runners and side-entry high-flow cat. I've never seen any of the big companies use side-entry cats. You do get what you pay for really.

[The Radium King]

thanks everyone, i appreciate the information. also, thanks for the heads-up on maxspeed - good to have a canadian vendor available (less shipping and duty for us canadians).

i'm not made of money, but i like to tinker. i'd save up for a performance exhaust if it provided benefit without detriment (torque loss at lower rpm). looking at the dyno results on the maxspeed website (NHP vendor) there doesn't appear to be a reduction in torque or power except for a bit of torque at 1800 rpm. otherwise a net increase.

those with experience in these things please advise - can you feel the torque loss at lower rpm? can you feel the hp gain otherwise?

dyno

thanks again.

ps - 2k3 - how do you like the shifter? i've read that b&m are too stiff; how does the schnell feel? is it the same unit that maxspeed sells for $99?

[2K3_Boxster_S]

Originally Posted by The Radium King

thanks everyone, i appreciate the information. also, thanks for the heads-up on maxspeed - good to have a canadian vendor available (less shipping and duty for us canadians).

i'm not made of money, but i like to tinker. i'd save up for a performance exhaust if it provided benefit without detriment (torque loss at lower rpm). looking at the dyno results on the maxspeed website (NHP vendor) there doesn't appear to be a reduction in torque or power except for a bit of torque at 1800 rpm. otherwise a net increase.

those with experience in these things please advise - can you feel the torque loss at lower rpm? can you feel the hp gain otherwise?

dyno

thanks again.

ps - 2k3 - how do you like the shifter? i've read that b&m are too stiff; how does the schnell feel? is it the same unit that maxspeed sells for $99?

1. first to clear up the NHP thing. Maxspeed (NHP) designs and specs the materials to be used. They are actually assembled overseas. do I care where it is assembled? no. The welds and materials are quality and my exhaust fit perfectly. and I wouldn't call $2400 for an exhaust system very cheap.

2. I would have to rip my entire exhaust off put stock back on and dyno to give you a definitive answer as to lower rpm TQ loss. at the end of the day car Dynoed with an overall increase in HP & TQ. 246 HP 218 TQ. The car felt nothing but faster to me.

3. Schnell feels fine to me. super short throws, if thats what you like. Have not missed a gear since installed. Needs a minor adjusment as the ball that fits into the selector (side to side movement) is a little sloppy. My cousin is a machinist, since this part is screwed into the shifter he is going to remake it with tighter tolerance.

Apparently anything that's not made in Germany is automatically considered crap to everybody on this forum.

Take a look at the OEM shifter that comes from the factory in your Boxster. It's garbage and has more plastic in it than a Toys R Us. The bottom linkage will eventually fail and the shifter will pop out leaving you stranded until it is upgraded.

Guess what they don't make Porshe's the way they used to. Lots of crap parts now a days.

[2K3_Boxster_S]

Originally Posted by ekam

NHP headers never look right in my eyes IMO, with the unequal length runners and side-entry high-flow cat. I've never seen any of the big companies use side-entry cats. You do get what you pay for really.

I didn't really care for them either that's why



These have been delivered and waiting to be installed. I am going completely catless and the sport Cat headers will be up on ebay soon.

[Tranlm]

Which brand are those?

Originally Posted by 2K3_Boxster_S

I didn't really care for them either that's why



These have been delivered and waiting to be installed. I am going completely catless and the sport Cat headers will be up on ebay soon.

[2K3_Boxster_S]

Originally Posted by Tranlm

Which brand are those?

THEY ARE (drum roll........) NHP

[Johnny Danger]

Originally Posted by 2K3_Boxster_S

I didn't really care for them either that's why



These have been delivered and waiting to be installed. I am going completely catless and the sport Cat headers will be up on ebay soon.

2K3,

I know that I have since been taken off of your Christmas card list for some of my previous remarks regarding your choice of equipment. However, I can tell you from experience that going "catless" will prove to be a bad decision. I assure you that you will experience a significant loss of low end to mid range torque, not to mention CEL problems galore.

[2K3_Boxster_S]

Originally Posted by Johnny Danger

2K3,

I know that I have since been taken off of your Christmas card list for some of my previous remarks regarding your choice of equipment. However, I can tell you from experience that going "catless" will prove to be a bad decision. I assure you that you will experience a significant loss of low end to mid range torque, not to mention CEL problems galore.

Yes, but it should sound really cool.

Your right no CATs is not good on NA engine, but for forced induction set-up's it's actually good. preparing for a DIY setup.

[Cloudsurfer]

Originally Posted by ekam

NHP headers never look right in my eyes IMO, with the unequal length runners and side-entry high-flow cat. I've never seen any of the big companies use side-entry cats. You do get what you pay for really.

Maybe I'm wrong about where they're made, but no one who knows anything about fluid dynamics, especially as it pertains to internal combustion exhaust design, would design a header that looks like that. Any decent headers you see will have merge collectors, and if catted, will have smooth transitions into and out of the cats- NOT a flat piece of metal welded to one side with a pipe on it (such that exhaust flow only goes through the middle of the grid) and then an exit on the side (so that whatever flow makes it through the middle of the grid has to now make a 90 degree (or tighter) turn in an extremely small radius.

Made in China or Canada or for all I care Nigeria, that's not the way to design a well flowing header.

[Johnny Danger]

I've experimented with several different exhaust configurations before choosing the final system for my 3.2 S. I found the following set-up produced the best results in terms of performance and reliability (keeping my vehicle OBD II compliant).
Here's my ditty:

1. A less restrictive, high quality after -market cat back exhaust.
2. By-passing/deleting the secondary cats (they're like having an extra set of thumbs).
3. Headers and cats that stick with the basic principles of the oem design, however, they incorporate longer, equal length primaries that flow into a merge collector, along with lower cell - high flow cats (something on the order of HJS 200 cell).

The final result yielded the following: No need to relocate O2 sensors, make bungs, chase CEL's, reprogram the ECU, or worry about emissions ! Excellent results in terms of improved power and performance. And perhaps equally important - great sound ! All this begs the question; who makes headers and cats that follow this design principle ? In all of my research and experimentation I discovered 2 companies that manufacture such a system. M&M exhaust in Germany ($$$$$$$$$$$$) who's products are imported exclusively by FVD/Brombacher and FabSpeed.

[Cloudsurfer]

Originally Posted by Johnny Danger

I've experimented with several different exhaust configurations before choosing the final system for my 3.2 S. I found the following set-up produced the best results in terms of performance and reliability (keeping my vehicle OBD II compliant).
Here's my ditty:

1. A less restrictive, high quality after -market cat back exhaust.
2. By-passing/deleting the secondary cats (they're like having an extra set of thumbs).
3. Headers and cats that stick with the basic principles of the oem design, however, they incorporate longer, equal length primaries that flow into a merge collector, along with lower cell - high flow cats (something on the order of HJS 200 cell).

The final result yielded the following: No need to relocate O2 sensors, make bungs, chase CEL's, reprogram the ECU, or worry about emissions ! Excellent results in terms of improved power and performance. And perhaps equally important - great sound ! All this begs the question; who makes headers and cats that follow this design principle ? In all of my research and experimentation I discovered 2 companies that manufacture such a system. M&M exhaust in Germany ($$$$$$$$$$$$) who's products are imported exclusively by FVD/Brombacher and FabSpeed.

There's your answer. No one ever said it was going to be cheap.